Nowadays, it seems to me that the structures of English grammar have changed. Academically speaking, certain expressions or sentence structures which were considered wrong in the past are now pleasantly accepted as correct by many experts of English. For example, it was wrong to say: " Everybody played their role ( they) in the past, but now it is grammatically acceptable. Even now, the use of " due to " to begin a sentence is widely used ( even in the UK, Australia, N.Z, US, West Indies, Malta, India, Singapore, Ireland, Pakistan ).

Another obvious structure is the mixture of British and American English structures in written English. e.g. the use of "color", program, " accommodations " ( American English ).

My concern is : If this mixture were to exist in the next 100 years, I 'm afraid that learners of English might be exposed to confusion to see which structure is better than the other. Furthermore, the grammatically-acceptable sentences may not play a pivotal role in modern writing.I can see this scenario even in academic writing or journal.

I do not whether there will be a correct English for the world in the future.
English has undergone three transitional periods : Old English ; Middle English and Modern English. The varied English structures now are the results of science and technology.

My question is : Is grammar important to the next generation of speakers ?

Thank you.